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| n˚ éch | T-25 |
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| T-26 |
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| n˚ anal | 34 | 41 | 42 | 43 | 52 | 59 | 64 | 15 | 20 | 35 | 36 |
| SiO2 | 40.10 | 39.94 | 39.94 | 40.17 | 40.19 | 41.07 | 40.54 | 40.89 | 41.74 | 41.23 | 41.82 |
| TiO2 | 0.22 | 0.15 | 0.10 | 0.20 | 0.03 | 0.25 | 0.17 | 0.05 | 0.25 | 0.01 | 0.03 |
| Al2O3 | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.03 | 0.40 | 0.01 | 0.00 | 0.04 |
| FeO | 7.80 | 9.60 | 8.00 | 8.00 | 7.90 | 7.90 | 7.50 | 7.80 | 7.60 | 7.80 | 9.50 |
| MnO | 0.38 | 0.13 | 0.24 | 0.26 | 0.29 | 0.28 | 0.16 | 0.38 | 0.21 | 0.12 | 0.28 |
| MgO | 48.50 | 47.80 | 48.25 | 48.00 | 48.50 | 48.15 | 48.30 | 47.00 | 47.50 | 47.20 | 49.00 |
| CaO | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
| NiO | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
| Total | 97.00 | 97.64 | 96.53 | 96.63 | 96.92 | 97.65 | 96.70 | 96.51 | 97.30 | 96.36 | 100.67 |
| Si | 1.00 | 1.00 | 1.01 | 1.01 | 1.01 | 1.02 | 1.01 | 1.03 | 1.04 | 1.03 | 1.01 |
| Ti | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
| Al | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 | 0.00 | 0.00 |
| Fe2+ | 0.16 | 0.20 | 0.17 | 0.17 | 0.17 | 0.16 | 0.16 | 0.16 | 0.16 | 0.16 | 0.19 |
| Mn | 0.01 | 0.00 | 0.01 | 0.01 | 0.01 | 0.01 | 0.00 | 0.01 | 0.00 | 0.00 | 0.01 |
| Mg | 1.81 | 1.79 | 1.81 | 1.80 | 1.81 | 1.78 | 1.80 | 1.76 | 1.76 | 1.76 | 1.77 |
| Ca | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
| NI | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
| Total | 2.99 | 3.00 | 2.99 | 2.99 | 2.99 | 2.98 | 2.98 | 2.97 | 2.96 | 2.97 | 2.99 |
| % Fo | 91.35 | 89.75 | 91.25 | 91.19 | 91.34 | 91.29 | 91.83 | 91.10 | 91.56 | 91.40 | 89.92 |
| % Fa | 8.65 | 10.25 | 8.75 | 8.81 | 8.66 | 8.71 | 8.17 | 8.90 | 8.44 | 8.60 | 10.08 |
| Mg+Fe2+ | 1.98 | 1.99 | 1.98 | 1.97 | 1.98 | 1.95 | 1.96 | 1.93 | 1.92 | 1.93 | 1.97 |
| Mg/Mg + Fe2+ | 0.91 | 0.90 | 0.91 | 0.91 | 0.91 | 0.91 | 0.92 | 0.91 | 0.92 | 0.91 | 0.90 |